Fixed typo in testcases module.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7032 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/test/testcases.py

@@ -108,7 +108,7 @@ class TestCase(unittest.TestCase):
 
     def assertContains(self, response, text, count=None, status_code=200):
         """
-        Asserts that a response indicates that a page was retreived
+        Asserts that a response indicates that a page was retrieved
         successfully, (i.e., the HTTP status code was as expected), and that
         ``text`` occurs ``count`` times in the content of the response.
         If ``count`` is None, the count doesn't matter - the assertion is true